Its a single
.cone device. All those things have some issues that simply can't be overcome.by any ammount of fanciness or promises by the inventor. I'm not saying they outright don't work, but there is not one that has come out of independant testing with flying colours (or that doesn't have horror stories).
There are massive loads on the one cone making it prone to breaking. I for one also have questions about the fast/slow mechanic
of the sea-brake. The fact tbat its only one cone means it can come out of the water
between wavetops in bad conditions and propel the boat forward at great speeds. It also means that the boat will constantly accelerate and stop again causing huge peek strains on the gear
and friction in the rope
. It will spin like mad, no matter what swivel you use. You can't adjust it to the conditions, etc etc.
Advantages are its smaller to pack.
If you do a lot of reading everywhere online you'll find that the JSD covers all issues a single
cone device might have without adding any at all. You'll find hundreds of amazing stories from all kinds of sources. You'll find backing by the USCG and many other well respected organisations and companies and apart from cones fraying and issues with the type of rope used (both easily fixed/prevented) you'll not find a single horrorstory.
My point is you should probably do your research
properly before you decide on this. I spent many, many hours researching this, and I value my drogue before any other safety equipment
I have. It is something you must be able to trust your life to. I couldn't trust that to anything but the JDS after my reading. Simply not enkugh solid backing for all the others, too many questilns and too many horror stories.